The air in the factory is filtered to remove impurities.
工厂里的空气经过过滤去除杂质。
Incoming air must be filtered, and its temperature and humidity controlled.
入口的空气必须得到过滤，并且它的温度和湿度也要适当。
Air leaving the lab is filtered.
离开实验室的空气要过滤。
One advantage is clean and filtered air.
一个优越性是经过过滤的空气清洁。
One advantage is clean and filtered air.
一个优越性是经过过滤的空气清洁。
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